<meta charset="utf-8">
(#) Android App links should only use http(s) schemes

!!! ERROR: Android App links should only use http(s) schemes
   This is an error.

Id
:   `AppLinkSplitToWebAndCustom`
Summary
:   Android App links should only use http(s) schemes
Severity
:   Error
Category
:   Correctness
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   8.8.0 (January 2025)
Affects
:   Manifest files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://developer.android.com/training/app-links/verify-android-applinks#add-intent-filters
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/AppLinksValidDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/AppLinksValidDetectorTest.kt)

In order for Android App Links to open in your app, Android must perform
domain verification. However, Android only sends domain verification
requests for `<intent-filter>`s that only contain http(s) schemes.

To ensure correct behavior, please split your http(s) schemes and other
schemes into two different `<intent-filter>`s.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
AndroidManifest.xml:7:Error: Split your http(s) and custom schemes into
separate intent filters [AppLinkSplitToWebAndCustom]
    &lt;intent-filter android:autoVerify="true" android:order="-1" android:priority="-1"&gt;
     -------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant source files:

`AndroidManifest.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.helloworld" &gt;
        &lt;uses-sdk android:minSdkVersion="31" android:targetSdkVersion="34" /&gt;

    &lt;application&gt;
        &lt;activity android:name=".SplitWebAndCustomActivity" android:exported="true"&gt;
            &lt;intent-filter android:autoVerify="true" android:order="-1" android:priority="-1"&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;
                &lt;uri-relative-filter-group&gt;
                    &lt;data android:path="/path" /&gt;
                    &lt;data android:query="queryparam=value" /&gt;
                &lt;/uri-relative-filter-group&gt;
                &lt;data android:scheme="http" /&gt;
                &lt;data android:scheme="custom" /&gt;
                &lt;data android:host="example.com" /&gt;
                &lt;data android:path="@string/path" /&gt;
                &lt;data android:path="/&lt;&amp;&apos;'" /&gt;
                &lt;data android:path='/single"quote' /&gt;
                &lt;data android:path="" /&gt;
                &lt;!-- Test having tags underneath the host elements as well --&gt;
                &lt;action android:name="android.intent.action.SEND"/&gt;
                &lt;uri-relative-filter-group&gt;
                    &lt;data android:path="/path" /&gt;
                    &lt;data android:query="queryparam=value" /&gt;
                &lt;/uri-relative-filter-group&gt;
            &lt;/intent-filter&gt;
        &lt;/activity&gt;
    &lt;/application&gt;
&lt;/manifest&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values/strings.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;resources&gt;
    &lt;string name="path"&gt;/path&lt;/string&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/AppLinksValidDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `AppLinksValidDetector.test_splitToWebAndCustomSchemes`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute
  `tools:ignore="AppLinkSplitToWebAndCustom"` on the problematic XML
  element (or one of its enclosing elements). You may also need to add
  the following namespace declaration on the root element in the XML
  file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;manifest xmlns:tools="http://schemas.android.com/tools"&gt;
      ...
      &lt;activity tools:ignore="AppLinkSplitToWebAndCustom" .../&gt;
    ...
  &lt;/manifest&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="AppLinkSplitToWebAndCustom" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'AppLinkSplitToWebAndCustom'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore AppLinkSplitToWebAndCustom ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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